Created attachment 975800 [details]
Description of problem:
in kernel log many messages: mmcblk0rpmb: timed out sending r/w cmd command, card status 0x400900
And disk operations slow down
*** This bug has been marked as a duplicate of bug 126342 ***
FWIW, this is an upstream kernel issue, see:
it particularly seems to affect the Asus T100. I'm not sure we need a Fedora bug for it, but it's nothing to do with the Fedlet kernel build as it happens.